Which is better? Coils or Leaves?

This is a difficult one to answer. Ultimately, whichever
is more easily installed will give the owner the most bang
for the buck. If you're the owner of a 80-91 truck that
can easily be adapted to coils or leaves, you have some
decisions to make. Both suspensions are capable of great
flex. Both are reasonably durable. Coil suspensions can
be built to have better approach angles, while leaf springs are
more easily installed and tuned.

I found a king pin D60 and a ball joint D60. Which is better?

The earlier king pin-style axle is prefered by wheelers
for its easy adaptablity to hi-steer conversions. It is
also believed to be slightly stronger and more durable.
However, if you aren't bothered by the difficulty of
steering conversions, the cost and condition of the axle
should be the driving factor in choosing.

What about this Chevy 60 I have sitting around?

Ford trucks are largely unique in using driver's side
differentials on their front axles. Chevy and Dodge use
passenger side diffs, which will require at least
a new transfer case to work under a Bronco. 95+ model
Dodges use a coil-spring, 5-link, driver's side diff.
However, these axles are not preferred because of their
small-diameter, low-spline axles.

That said, the purpose of this FAQ is putting a FORD
D60 under a FORD Bronco. You're free to put a Chevy
under your rig. It can be done, but this paper isn't
going to tell you how.

I found an axle out of a dually F-350, but it has weird hubs. Can I still use it?

If you find a dually F-350 axle for cheap, you can swap
the hubs to single rear wheel parts using F-250 TTB Dana 50
hubs.